Blindstitch sewing-machine.



L. ONDRUK. BLINDSTITCH SEWING MAHINE:

APPLICATION FILED DBC. e, 1907. l

' Patented Mar. 23, 1915.

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. Wim/5555s JNI/ENTOR L. ONDERDONK. BLrN-DSTLTGH gBW-mef MAGHlNE.

APPLICATION FILED DEG. 6. 1907`.

-Pteted Mar., 23s 1915.

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L NSING ONDERIDONK, OF NEVI YGRK, Y., ASSIGNOR TG UNON SPECIAL MACHINE CMPANY, OIF CHCAG, ILLINOIS, A CORPDRATIONUF ILLINOIS.

BLINDSTITCH SEWNG-MACHINE.

Specification of Letters Patent.

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Application filed. December 6, 1907. Serial No. 405,356.

2"@ all w/iom it may l1oncem:

Be it known that l, Lansino Ononiinonn, a citizen of the United States, residing'at New York, in the county of New `iork, State of New York, have invented certain new and useful Improvements in Blindstitch Sewing-Machines, (Case (1,) of which the following is a description, reference being had to the accompanying drawing, and to the letters and figures of vreference marked thereon.

,My invention relates to new and useful improvements in blind stitch sewing machines, andhas for its object to provide means :for properly holding and guiding the material to the stitching mechanism.

A. further object of my invention is to provide means for properly guiding 4the needle so as to prevent all undue lateral vi bration thereof.

Stili further objects of my invention will in part be obvious and will in part be more fully hereinafter pointed out.

In the drawings, which show by way 0In illustration one embodiment et my invention; Figure l-is a front elevation of a sewing machine embodying my invention, with certain parts omitted and broken away for the sake of clearness. Fig. 2 is a similar View taken from the rear of the machine.

F ig. 3 is a detail sectional view showing the I stud and also the manner inneedle lever which the presser members are mounted thereon. F ig. 4 is a detail View in end elevation of the work support and the presser Fig. 5 is a dctailfview showing the presser member and the needle 'groove therein. Fig. 6 is a detail view partly iii section showing a slightly modified loi'in ol guide groove for the needle. Fig. 7 a detail view showing a modified forni or' presser supporting shank.

The work support l, carries a ridge -l'orniing member 2 having formed therewith leeding surfaces 3, 3. The overliangiiig arm et is provided withA a bearing in which is mounted a stud t3, which is tapered asshown in Fig. 3 of the drawing, and extends outwardly at each side of said bearing. The collar 7, surrounds the stud and a nut 8 threaded on said stud, liriiily holds the stud Between the nut 8 and .the frame of the machine, are mounted two collars 9 and l0. The collar 9 is provided with an outwardly ends, and serves -by means or' the crimping ridge.

-Tlie work su )Oort l is raised needle, oseillates,

outwardly and downwardly extending arm 13 which vcarries a presser member 14, at its lower end. .A spring l5, mounted on a pin 1G at its upper end, engages the arm 11 which supports the presser member 12, and hoids the same yieldii'igly against the side of the ridge crimping' member 2. yThe adjustable thumb screw l?, carried by the lug 18 engages the spring l5 between its ends, and by adjusting said screw, the tension on said spring may be varied.

A stop nut i9 serves to lock the adjustable screw in its adjusted positions. rI'he spring 20 carried by the` pin "3l at its upper end, engages tho arm 13, which supports the presser member 14. An adjustable screw 22 carried by a lug' Q3, engages said spring between its as a means for varying the tension ol said spring. The stopl nut 2l, serves as a means for locking the adjusting screw in its adjusted position.

Located iiiterii'icdiate thevarms ll and 13, is a shaft 25 which vcarries at its forward end a hand lever 26. ,The shaft 25 carries at its rear end a cam member 27, which is located in the plane of the-arms ll and 13. When the "-lever 2G is turned by hand, the cam portions of the cam :2.7, engage 'the arms 1l and 13 and separate thesame, thus, moving the presser members from the ridge forming member.

The presser members erably so located when in closed position, that they are spaced sufficiently to allow the material to be pressed up between the saine have piiovided a stop pin 2S which limits the inward,movement of the'presser members when there is no material in the machine. and lowered for the insertion of the iiiateri'al by any suitable means.

The needle 29 is carried by a needle lever 30, which'is mounted on the forwardly projecting portion 0i' the stud (i, lt will 'therefore, be seeii that the axis about which the f coincides with the axis about-which the presser members swing. The work sup )oi-t, whenraised to its non mal position for operation is held rigidly and therefore, as the work passing through the machine varies in thickness the presser members, l2 and lll willv be gradually moved.

back and forth J 'lhe presser member le is preferably provided with a needle guiding groove 5l and the needle is so located as to engage saidv less of its position, will ietain a deiinite position relative to the needle.

The needle is' oscillated by means of a link 32 in any suitable manner.' Coperating with said needle, l preferably use a thread carrying looper and spreader, such as shown in my coqending `:Mnplicatiori Serial No. 405,359, led of even date herewith, although any other form of complemental stitch forming mechanism may be used Without in any way departing from the spirit ot my invention. i

'llhe presser member 14 is cut away so as to give clearanceto the needle.

ln Fig. 6,1 have shown the clearance groove in the presser foot as formed on substantially the same arc as the arc of a needle. Bycutting the groove in the presser foot in this manner, l cut away as little material as `possible and furthermore, form a better supporting surface for the needle.

ln lfig. 7, l have shown the shank of 'the presser foot as extending down below the stitching point and the presser foot curved, as at ll', substantially on the same arc .as the'crimping rib so/ that the material after passing the stitching point will be deflected downward and properly held relative to the crimping member and work support. lt will also be noted from this figure that the front portion of the work support extends upward above the stitching point, so that the material may be readily inserted beneath the presser foot.

Having `thus particularly .described my invention, what l claim as new and desire to secure by Letters Patent, is 1. The combination with an overhanging arm, a curved needle, means for oscillating the saine,` a work support, a crimping ridge carried thereby, presser mcmbcrs'piv oted so as to swing independently on an axis fixed relative to the overhan'ging arm and coincident with the axis of the needle, and means for swinging the presser niembers on said axis.

Q. The combination with a work support having means for crinfipi'ng` the fabric, a curved needle, means for oscillating said needle, and a plurality of oppositely disposed presser members, each of which is v presser and presser members each of. which is pivoted on an asis co-incident with `the axis of the needle lever, said presser members being disposed on opposite sides of saidcrimping ridire.

support, a crimping ridge carried thereby, presser members each-of which is pivoted on an axis (3o-incident with the axis of the.

needle lever, said presser' members being disposed on opposite sides of said crimping ridge, means for yieldingly holding said presser members in engagement with the crimping ridge.

5. 'lfhe combination of a work support, a

crimping ridge carried thereby, Aan over hanging arm, a needle lever pivoted thereon,

a lneedle carried by said needle lever and presser members, each of which is pivoted on an axis co-incident with the axis of the needle lever, said presser members being disposed on yopposite sides of said crimping ridge.

lhe combination of a work support, a crimping ridge carried thereby, an overhanging arm, a needle lever pivoted thereon,

a needle carried by saidI needle lever and presser members pivoted on an axis cofinciu e. 'l he combination of a curved needle, a needle lever supporting the same, a Werl dentwith the axis of the needle lever, said presser members being disposed on opposite sides of said crimping ridge, means` for yieldingly holding said presser members in engagement with the crimping ridge and means for separating said presser members.

i". rthe combination with a work support, a crimping ridge carried thereby, an overha'i'iging ar'in having a reduced portion at the lower end of itshead, a stud passing through said reduced portionI and clamped therein, a needle lever pivotcd on said stud on one side of said reduced membeiga .needle carried thereby. and a presser member pivoted on said stud on the other side of said reduced member, and means for holding said presser member in contact with said crimping ridge.

S. The combination with a work support, a crimping ridge carried thereby, an overhangiug arm having va. reduced portion `at the lower end of its head, a stud passing through said reduced portion and clamped therein, a needle lever pivoted on said stud on one side of said reduced member, `a needle carried thereby, and e plurality of members mounted on said stud on the other side of sai-d reduced member and caliper-ating vte; held. the 'Work u ixin` said crimping vige, and yea'nsfor sepa-rating said presser members. .I

9. 'lliecombmetion'with a work support, a crimpingnl`- eearried' thereby, an overhanging arm, .e-fieedle lever pivoted on said orerhanging. arsonl a needle earried thereby, a pair .presse 'members-seeker which is piroted on ani, seov-inei'deiitlwitii the axis of said needle, said presser, ,members being located one e ahh side Aet"v thefcrimping ridge, andni ,for holdingfsaidpresser members invv Veri'ti'iot "with" said crimping ridge. I

l0. The combination 'witl' a yworlr support, a erimpingvridge carried-thereby, an overhanging arm, a needle lever'rpiveted on said oyerliangingv arm, a -ne'ed'le Vearried thereby, a pair ef presser members pivoted on an axis eo-ineident with the axis 'of said needle, said presser` members being located one on each side` of the Crimping ridge, springs for yieldingly holding ,said presser members in Contact `with said erimping ridge and means `for separating the presser members.

l1, The combination with a Work a erimping ridge carried thereby,

support, an onerhanging ern-a needle lever piyoted on said a needle carried thereby,\.;

overbrenging arm, e pair of presser members axis izo-incident with the anis said presser members being located one on each side of the crimping ridge, springs i'or yieldingly holding said presser members in Contact with said Crimping ridge, and means for separating the members, and means for the tension on said springs` 12. The combination with Werl: support, a erinfipingw ridge carried thereby, an overhanging,r arm, a needle lever mounted on said overhanging arm, a needle carried thereby, presser members piveted on an axis (zo-incident with the exis of said needle len intermediate. presser niempi voted en an operating said cam.

lil'. The combination with a Work support, a crimping ridge `carried thereby, an overlianging arm, a needle lever mounted on said overlmnging arm, a needle carried thereby, presser members piroted on an axis eo-ineident with the ir-:is or said leifer, a eem inten mediate said presser members for separatingthe same, means for operating said cam, springs for engaging said presser member, whereby the same are' held against the crimping" ridge.

lil. The combination with a. Work support,

or' a erinipii'ggrirlgiecarried therelivfan dreijhangingg arm, a needle lever .mounted on said rnerhang'mg arm, a needle Carried thereby, presser members pivot-ed on :in axis -bers for separating the -lianging arm,

of said needle,`

.eident with theV axis oi the `means for-yleldlnglv holding sald pressert' izo-incident With the axis of said needle lever, a @am intermediate said presser memsame, means for operating said earn, springs for engaging' said presser members, whereby the same are held against the crimping ridge, 'and means for adjusting the tension on said spring.

l5. The combination with awork support, of a crimping ridge carried thereby, an overhanging arm, presser members located ou bpposite sides of the crimping ridge pivoted on a. common axis on said overhanging arm so as to swing independently, a needle lever mounted on an axis co-ineident to the axis of said presser members, a needle carried by Said needle lever, and so disposed that the' path of said needle passes over said presser members.

16. rl`he combination with a work support, of a crimping ridge ce rried thereby, an over a needle lever pivoted on said overhanging, arm, a needle carried thereby, presser members movable independently and disposed on opposite sides of the crimping ridge and means for supporting said presser members on an, axis coincident With. the axis ofthe needle bar, whereby said presser members' retain a constant position relative to the' path -ol of the thickness of the fabric operated A 17. The combination. of a work support normally rigidly held in operative positiom a crimping ridge carried thereby, an'overf hanging arm, a'needle, a needle lever pivoted on said overhanging arm, presser members and means for yieldingly supporting seid presser members, whereby the same maintain a constant iosition relative to the path of the needle, irrespective of the thiekness of the fabric operated upon.

18. The combination of a Work support, normally held in, rigid operative position,

crimping ridge'oarried thereby, an overhanging arm, a needle lever pivoted on said everlianging arm,A a needle carried thereby, presser members located on opposite sides el said erimping ridge pivoted so as to swing independently on an axis (1o-incident with the exis or the needle lever, means for yieldingly holding;` said presser members in Contaetewith said crimping ridge, and means `l"or se].iaratingr said presser n'iembers. l

19. The combina-tion of a Work support normally held in rigid peratiye position, a crimping ridge carried thereby\-t n overhanging arm, a needle lever pivotedmsaid overhangjing arm, a needle carried tl1ereb`y presser members pivoted on an axis oofinneedle lever, members said erimpingi` ridge, a earn mounted between said presser members for separating the said needle lregardless in Contact with tlre' material ofi same, and. 'a hand lever for operatiiigseid cam. v f

20. The combination of .e curved need-ie,

a needle lever supporting the same, liWork eident 'eiwit-tbv the exis of the needle lever. L means vfor yieldingly holding seid presser membersin engagement with the crimping ridge, additionai means tor holding said. presser members from pressing mi the crimping ridge when there are no gemis under said presser members.

ln testimony whereof ii afiix my signe.- ture, 1n presence of two Witnesses.

LNSXNG QNDERD'NFL Witnesses: R. S. OSWALD, y

.WALTER HARTLEY. 

